Not a bad idea overall, a lot of companies use SMS (which I imagine is the back end protocol you are using) for this exact purpose. They post a contact form on the intranet for tech problems, and when someone fills out the form it e-mails and text messages the IT person on call. Can be very useful if implemented correctly.

I would suggest looking into advertising on technical or web related forums. Technet, dice.com, sourceforge.net, etc. Industry magazines geared toward either Internet Marketing or Internet business, and their associated web sites and forums could be another good venue.

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